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Mar 11

According to one client’s requirement GN will make some improvement to one CSM drilling fluid process system made by another manufacturer. The user told us, they found present system is not as efficient as they could be. Considering certain working conditions and actual performance GN optimize the drilling fluid process unit.

Why should this CSM drilling fluid system be optimized?

Usually when this type system ran on several holes the mud SG is difficult to maintain below SG1.1 and a thick soft wall cake due to the amount of superfines/silt. Sand content was less than 1% so the mud weight increase was mostly due to having a large amount of superfines. There is also fine sediment build up in each tank (including clean tank). Then if the overall tank levels was a little lower than usual it was easy to run the Desander pump dry as there is no return to this tank if not drilling.

CSM Drilling Fluid Process System

CSM Drilling Fluid Process System

After our engineer looking at the design and performance of the system as well as drawing from previous experience GN will make pretty simple changes that seems to have difference to the units ability to maintain mud properties. We have made other changes that were done just to make the CSM drilling mud system more user-friendly.

The detailed changes on this type drilling fluid system

1. First stage

* Added skirts to scalping shaker subframe so fluid did not run on top of tank
* Cut clearance into scalping shaker subframe to allow full 5 deg inclination
* Sub frame on scalping shaker directs underflow into Chute only – this sub frame self cleans with fluid
* Chute in dirty tank preferentially feeds all fluid and cuttings from scalping shaker underflow to Desander pump suction – all particles in the tank now feed directly to the suction of the Desander pump
* Overflow channel that divides the overflow from the clean tank to the dirty tank and intermediate tank – stops the Desander pump running dry
* Added 12″-10″ directional tube to capture overflow from desanders to create turbulence in intermediate tank – no backpressure on hydrocyclones due to design
* Changed walkway mesh for 200mm so cuttings go through mesh and do not build up
* Added rubber to shakers to ensure cuttings do not enter tank from below shale shaker and above sub frame
* Increased spigot size in 4″ hydrocyclones – need to go into more detail on this as I believe that allot more can be done to improve the separation
* Fitted a ladder support to unit so that supports the ladder on uneven ground
* Added Ladder carry brackets on skid for transport

* Modified all walkways and cutting chutes to fold up inside 2.5m without removal
* Fitted mesh screens that stay in place to cover the shaker openings for safety during assembly/disassembly
* Added 3″ fill connection to clean tank
* Added several 2″ sampling valves to clean tank
* Added diffuser plate below mixing hopper discharge in clean tank – this was causing cavitations in the rig pump as air was being pulled into the suction directly below


2. Further amendment


* Fit visual level indicator to dirty tank (including level sensors that we will wire to the existing audible alarm)
* Modify overflow channel to direct flow back into Chute


Result of optimizing CSM drilling mud process system

The changes we have made are pretty simple ones and could be incorporated in initial manufacture. GN knows no one likes to shovel out tanks and better mud properties is a better outcome for everyone. The benefit of our changes are that they are permanent and do not require adjustment they just ensure the unit is working as it should, clean mud with good wall cake and filter loss properties and clean mud tanks at the end of the job – after all that’s what solids control is about

If you want to talk more on how to improve a system just email or call GN Solids Control.

written by GN Desander Desilter \\ tags: , , , ,

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